| 摘要 |
A portion of a collimated light beam is directed at an article, and the resultant shadow-containing beam is reflected by a mirror onto a linear photodiode array. A second portion of the collimated beam is initially reflected by the mirror toward the article. The resultant shadow-containing beam impinges upon a second portion of the diode array. The positions of the two shadows on the array are indicative of the X and Y positions of the article. The scanned output from the array is processed to generate two binary signals representative of the X and Y positions.
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